I am worried about my Black Copper marans. I went outside to visit my marans and noticed 2 of them (my main roo and one of my pullets) having a little bit of a rattle when they breathed. They are about 5 months old now, and both look just fine, bright eyes, good color and appetite, just a little rattle/wheeze. I immediately went to the medicine cabinet and broke out the Tylan 50 and Vetrx, and gave some to each one of them. Is there anything else I should do. I asked this on the marans thread because I wanted to hear from marans people in case this is something that is common to the breed.